单项选择题
Which of the following devices is common to both mechanical and hydraulic governors?（）
A.Direct linkage between the ball-head and fuel rack B.A servomotor C.A compensating device D.Flyweights
单项选择题 Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?（）
单项选择题 The longer the ignition delay period occurs in a diesel engine, the （）.
单项选择题 Poor combustion in a diesel engine can be caused by （）.
